gray2

[grey] /greɪ/

noun, Physics.

1.

the standard unit of absorbed dose of radiation (such as x-rays) in the International System of Units (SI), equal to the amount of ionizing radiation absorbed when the energy imparted to matter is 1 J/kg (one joule per kilogram).

The distinction between British grey and U.S. gray developed 20c. The noun is c.1200, from the adjective. Gray as figurative for "Southern troops in the U.S. Civil War" is first recorded 1863, in reference to their uniform color. Expression the gray mare is the better horse in reference to households ruled by wives is recorded from 1540s. The verb is 1610s (with an isolated instance from late 14c.). Related: Grayed; graying.

(grā) The SI derived unit used to measure the energy absorbed by a substance per unit weight of the substance when exposed to radiation. One gray is equal to one joule per kilogram, or 100 rads. The gray is named after British physicist Louis Harold Gray (1905-1965).

A parser generator written in Forth by Martin Anton Ertl anton@mips.complang.tuwien.ac.at. Gray takes grammars in an extended BNF and produces executable Forth code for recursive descent parsers. There is no special support for error handling. Version 3 runs under Tile Forth Release 2 by Mikael Patel. (1992-05-22)

unit of absorbed dose of ionizing radiation, defined in the 1980s by the International Commission on Radiation Units and Measurements. One gray is equal approximately to the absorbed dose delivered when the energy per unit mass imparted to matter by ionizing radiation is one joule per kilogram. As a unit of measure, the gray is coherent with the units of measure in the International System of Units (SI). The gray replaced the rad, which was not coherent with the SI system. One gray equals 100 rads